b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
120 lines
3.7 KiB
JavaScript
Executable file
120 lines
3.7 KiB
JavaScript
Executable file
/**
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* Sane equivalence checking, originally from loggest's rdcommon/log.js.
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*/
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at:
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Raindrop Code.
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*
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* The Initial Developer of the Original Code is
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* The Mozilla Foundation
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Andrew Sutherland <asutherland@asutherland.org>
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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/**
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* This module exports a single comparison function:
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*
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* equal(a, b) -> boolean
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*
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*/
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define(function(require) {
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/**
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* Maximum comparison depth for argument equivalence in expectation checking.
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* This value gets bumped every time I throw something at it that fails that
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* still seems reasonable to me.
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*/
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var COMPARE_DEPTH = 6;
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function boundedCmpObjs(a, b, depthLeft) {
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var aAttrCount = 0, bAttrCount = 0, key, nextDepth = depthLeft - 1;
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if ('toJSON' in a)
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a = a.toJSON();
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if ('toJSON' in b)
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b = b.toJSON();
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for (key in a) {
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aAttrCount++;
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if (!(key in b))
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return false;
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if (depthLeft) {
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if (!equal(a[key], b[key], nextDepth))
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return false;
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}
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else {
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if (a[key] !== b[key])
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return false;
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}
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}
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// the theory is that if every key in a is in b and its value is equal, and
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// there are the same number of keys in b, then they must be equal.
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for (key in b) {
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bAttrCount++;
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}
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if (aAttrCount !== bAttrCount)
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return false;
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return true;
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}
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/**
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* @return[Boolean]{
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* True when equivalent, false when not equivalent.
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* }
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*/
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function equal(a, b, depthLeft) {
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if (depthLeft === undefined) {
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depthLeft = COMPARE_DEPTH;
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}
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var ta = typeof(a), tb = typeof(b);
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if (ta !== 'object' || (tb !== ta) || (a == null) || (b == null))
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return a === b;
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// fast-path for identical objects
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if (a === b)
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return true;
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if (Array.isArray(a)) {
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if (!Array.isArray(b))
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return false;
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if (a.length !== b.length)
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return false;
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for (var iArr = 0; iArr < a.length; iArr++) {
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if (!equal(a[iArr], b[iArr], depthLeft - 1))
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return false;
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}
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return true;
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}
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return boundedCmpObjs(a, b, depthLeft);
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}
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return equal;
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}); // end define
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